Numbers n such that n!3 - 3 is prime, where n!3 = n!!! is a triple factorial number (A007661).

Terms

a(0) =5a(1) =10a(2) =11a(3) =13a(4) =16a(5) =22a(6) =28a(7) =71a(8) =74a(9) =94a(10) =119a(11) =121a(12) =134a(13) =157a(14) =200a(15) =262a(16) =286a(17) =484a(18) =1039a(19) =1045a(20) =1190a(21) =1595a(22) =1679a(23) =1772a(24) =1789a(25) =2410a(26) =2920a(27) =5039a(28) =7919a(29) =10462